Retrieves the stock id used for the icon, or NULL if there is no icon or if the icon was set by some other method (e.g., by pixbuf, icon name or gicon). Since 2.16
Icon position
A stock id, or NULL if no icon is set or if the icon wasn't set from a stock id
See Implementation
Retrieves the stock id used for the icon, or NULL if there is no icon or if the icon was set by some other method (e.g., by pixbuf, icon name or gicon). Since 2.16